Grinding wheel truing apparatus



Dec. 7, 1943. L.- A. KASPARSON 2,336,013

GRINDING WHEEL TRUING APPARATUS Filed July 11, 1941 2 Sheets-Sheet 1 Fly] L. A. YKAS'PARSON I 2,336,018

GRINDING WHEEL TRUING APPARATUS Dec. 7, 1943.

2 Sheets-Sheet 2 Filed July 11, 1941 LEN/ HHTHKHSPHRE 0N Patented Dec. 7, 1943 UNITED STATES PATENT 2,336,018

GRINDING WHEEL TR ING APPARAi iiS Lennart A. Kasparson, Worcester, Mass, assi'gfior to Norton Company, Worcester, Mass; a car-- poration of Massachusetts Application July 11, 1941, Serial No. 461,963

2 Claims.

The invention relates to grinding machines, and more particularly to a grinding wheel truing apparatus for generating either a true cylindrical or a curved face onthe operative surface of a grinding wheel.

One object of the invention is to provide a simple and thoroughly practical combined radial and straight grinding wheel truing apparatus. Another object of the invention is to provide an improved radial grinding Wheel truing apparatus which is arranged to true either a cylindrical face, an arcuate face, or a combined cylindrical and arcuate face on the operative surface of a grinding wheel. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiment of the mechanical features of this invention,

Fig. 1 is a fragmentary cross-sectional view through the grinding machine, illustrating the improved grinding wheel trui-ng apparatus in elevation and s'howingthe grinding wheel feed ing mechanism partly'in section; h

Fig.- 2 is a vertical sectional View, on an enlarged scale, through the grinding wheel tru-in-g apparatus;

Fig. 3 is a plan view, on an enlarged scale, of the grinding wheel truing apparatus; and I Fig. 4 is a fragmentary sectional view, onan enlarged scale, taken approximately on the line l4 of Fig. 3, showing the detachable actuating lever for the truing apparatus.

A grinding machine has been illustrated in the drawings comprising a base I having a transversely movable grinding wheel slide ll mounted on the usual V-way and flat way (-not shown) on thebase. The wheel slide H serves as a support fora rotatable grinding wheel spindle I2 which in turn supports a rotatable grinding wheel 13. The grinding wheel spindle [2 may be driven by any suitable .source of power, such as those well known in the art, that is, either an electric motor mounted on the wheel slide l l, or an overhead drive shaft. A driving belt l4 transmits power from the source (not illus-' trated) to a pulley l5 mounted on the end of'the wheel spindle [2.

The grinding Wheel slide .H may be moved transversely relative to theibase It by a suitable wheel feeding mechanisnis'uch as; for ample, that shown in the prior U. S patent to Charles H. Norton, No. 762,838 dated 'June :190 4 to which reference may be had for details of disclosure not contained herein. This feeding mechanism may comprise a depending half nut it which isfirged-ly mounted on the under side of the wheel slide I l and a rotatable feed screw I 1 which is rotatably Jorirnalled in bearings (not shown) in the base I 0. The forward end of the feed screw l! is slidabl-y keyed within a rotatable sleeve l8 which is journalled in a bearing 19 formed with-in the base I 0. A shaft 20 is formed integral with the sleeve I 8 and is journalledin-a bearing 2 -l formed inthe base 0. 4 gear 22 is mounted on the outer end of the shaft 2 Q and meshes with a pinion 23. The pinion 23 is rotatably supported on a stud (not shown) to rotate with a gear ;24 which is formed as part of a manually operable feeding wheel 25. Arnicrometer wheel feeclad justing mechanism ZG is provided whereb-y the infeeding movement of the grinding wheel 23 may be stopped in a desired adjusted position. i

A longitudinally reciprocable Work supporting table 211s slidabl-y supported on a flat way 23 and a-V-way :Zaformed on the upper surface of the base ID to support the table for a longi tudinal reqi procatory movement relative to the base H].- The table serves as a Support for a swivel table 30 which in turn serves as a support for a rotatable work piece (not shown) and also as asupportfora truing apparatus,- as illustrated in the drawings. Thetable 2;! is arranged to be traversed longitudinally by means of a rack bar 3| depending from the under side of the table 21 by means of a manually operable traverse mechanism such as; for example; substantially thesarne as that shown in the prior patent to Norton abovereferre d to. 7

The improved grindingwheel truing apparatus may comprise a base 3?- which ;isprovided with bearing surfaces 33, 34 and ;35 (Fig: 2') which mate with correspondingly shaped surfaces formed on the upper portionyof the swivel table 30. A-clamping member 36 is pivotally sup? ported by astud 37 pn thebase member 32. The clamping member 36- is connected by means ,of a link ;38 witha rod 39 Whichis slidably mounted within an .aperture 4 0' formed in the base mem ber 32.- The left-hand enact the rod 39; isfiprovided with a threaded portion M which: is ens eea e' wit a ma ua l o e ab .nu by means-of which -the;olam-ping member 36' may be actuated-either to clampthe" steadyrest: base member 32 in an operative truing position on the swivel table 39, or may be unclamped to facilitate removal of the truing apparatus from the swivel table after a truing operation has been completed.

An arcuate shaped member 45 is fixedly supported on the steadyrest base 32 by means of a lurality of screws 46 and 41. The arcuate shaped member 45 is provided with an inverted V-shaped slideway 48 which serves as a support for a truing tool slide 49. The truing tool slide 49 is provided with a correspondingly shaped inverted V-way which mates with the V-way 48. A plate 59 is fastened to the under side of the truing tool slide 49 (Figs. 2 and 4) and is provided with a bearing surface which engages and mates with the under surface of the arcuate plate 45. A shim 52 is interposed between the plate 56 and the of which the parts may be adjusted so that the slide 49 is slidably held without lost motion on the inverted V-way48;

The truing tool slide 49 is provided with a cylindrically shaped aperture 53 which serves as a support for a truing tool holder 54 which supports a diamond or truing tool 55. The holder 54 is held against a rotary movement by means of a key 55 and is arranged to be clamped in adjusted position by means of a binder screw 51. A stop screw 58 is screw threaded into an end cap 59 and is arranged to butt against the end of the holder 54. The screw 58 serves to facilitate adjustment of the position of the diamond or truing tool 55 relative to the aXis of movement of the arcuate slideway 48 so that the radius of curvature generated or trued upon the periphery of the grinding wheel l3 may be readily adjusted as desired. A pair of adjustable stop screws 60 and 6| are fixedly supported relative to the steadyrest base 32 and serve in a manner to be hereinafter described to limit the arcuate swinging movement of the truing tool slide 49. A locating plunger 65 is slidably supported by an upwardly extending portion 66 of the steadyrest base 32. The tapered end portion of the plunger 65 is arranged to be moved into a mating notch 6! formed in the truing tool slide 49 and serves to locate and hold the diamond 55 in a center position for truing a cylindrical face on the grinding-wheel 13. The upper part of the boss 66 is provided with a slot 68. A binder or clamping screw 69 passes through a clearance aperture on one side of the slot 68 and is screw threaded into the boss on the other side and serves to clamp the plunger 65 in adjusted position when desired.

In order to facilitate an arcuate swinging movement of the truing tool slide 49, a manually operable, readily detachable handle lfl is provided which is shaped on its forward end portion to engage a socket '|.I fixedly supported on the upper surface of the truing tool slide 49. The handle is provided with a downwardly extending integral stop lug 12 which is arranged to move in the path of the stop screws 60 and 6| so as to thus limit the arcuate swinging movement of the truing slide 49. When it is desired to true a radius or curved face on the corner of the grinding Wheel IS, the handle 10 is inserted in the socket H and the plunger 65 is moved toward the left (Figs. 2 and 3) to disengage the plunger 65 from the notch 61. The manually operable lever 19 is then manually swung through an arc of substantially ninety degrees into position 19a (Fig. 3), during which swinging movement the truing truing tool slide 49 by means tool swings from the full line position (Fig. 3) into the broken line position 55a so that it generates a quadrant upon the face of the grinding wheel. It will be readily apparent from the foregoing disclosure that by adjusting the position of the diamond or truing tool 55 toward or from the axis of the arcuate swinging movement of the truing tool slide 49, the radius of curvature generated on the wheel periphery may be varied as desired.

In case it is desired to true a radius or curved face on the other corner of the grinding wheel l3, a second socket 13 is provided on the truing tool slide. The manually operable handle Ill may be inserted within the socket l3 and the truing tool slide 49 swung in a counterclockwise direction until the stop lug 12 engages the stop screw 61 to generate a radius or curved face On the other corner of the grinding wheel. By merely shifting the manually operable handle from socket H to socket 13 or vice versa, the truing apparatus is adapted for truing a radius on either corner of the wheel or may true a cylindrical face thereon by locking the truing tool slide 49 in a center position.

The operation of this truing apparatus will be readily apparent from the foregoing disclosure.

Assuming the stop screws and BI to have been previously adjusted to facilitate a swinging of the truing tool 55 through an angle of substantially ninety degrees, and assuming the truing tool 55 to have been radially adjusted to generate the desired radius on the grinding wheel l3, the grinding wheel [3 is fed into a forward or grinding position, after which the micrometer adjusting mechanism 26 is adjusted to allow an advancing movement of the grinding wheel by an amount it is desired to true from the face thereof.

In case it is desired to true a cylindrical face on the wheel, the plunger is maintained in engagement with the notch 61, in which position the table 21 may be traversed longitudinally to traverse the truing tool 55 across the peripheral face of the grinding wheel 15 to generate a cylindrical surface thereon. If it is desired to true a radiusor curved face thereon, the manually operable handle 10 is inserted in either the socket H or the socket I3, the plunger 65 is then withdrawn from the notch 61, and the manually operable handle or lever 10 is swung in either a clockwise or counterclockwise direction through an arcuate path of substantially ninety degrees to generate a radius on the desired corner face of the grinding wheel. a

It will be readily apparent that, as illustrated in Fig. 3 of the drawings, if desired a combined cylindrical surface and radius may be generated on the operative face of the grinding wheel, that is, by first locking the diamond in a position as shown in Fig. 3 to generate a cylindrical face, after which the plunger 65 is released from the notch 61 and the truing tool slide swung in an arcuate path in a clockwise direction to generate the curved face or radius thereon.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth,.it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is .to be'interpreted as 11- lustrativ and not in a limiting sense.

g 1. In a grinding machine truing apparatus having a base which is arranged to be detachably mounted on a grinding machine table, an 'arcuate V-shaped slideway fixedly supported on said base, a truing tool slide having a slideway to mate with said V-shaped slideway, a truing tool adjust'ably supported on said slide, a pair of adjustable stop screws supported on said base, a manually operable handle which is detachably supported, a pair 'of spaced sockets on said slide to facilitate locating said handle in one of two positions on said slide to swingsaid slide and trui'ng tool through an arcuate path to true a radius on either corner of a peripheral face of a grinding wheel, said handle having a depending portion which moves in the path of said stop screws to limit the arcuate swinging movement of the truing tool.

2. In a grinding machine truing apparatus having a base which is arranged to be detaohably mounted on a grinding machine table an arcuate V-shaped slideway fixedly supported on said base; a truing' tool slide having a way mating with the arcuate V shaped slideway, a truing tool adjustably supported on said slide, a pair of adjustable stops, means including a manually operable locating pin to locate said slide and truing tool in position for truing a cylindrical face on a grinding wheel, a readily detachable, manually operable handle on said slide, a pair of spaced sockets on said slide to facilitat attaching said handle in one of two positions, and a lug formed integral with said handle which is arranged in the path of said stops to limit the arcuate movement of said slide.

LENNART A. KASPARSON. 

